#include <stdio.h>

#define len 8

int erfenfind(int *arr,int findnum,int left,int right)
{
	if(left>right)
	{
		return -1;
	}
	int mid=(left+right)/2;
	if(arr[mid]==findnum||arr[left]==findnum||arr[right]==findnum)
		return 0;
	else if(arr[mid]>findnum)
		return erfenfind(arr,findnum,left,mid-1);
	else
		return erfenfind(arr,findnum,mid+1,right);
}


int main(int argc, const char *argv[])
{
	int arr[len]={1,3,5,7,9,11,13,15};
	int findnum;
	scanf("%d",&findnum);
	int ret=erfenfind(arr,findnum,0,7);
	if(ret==0)
	{
		printf("yes\n");
	}
	else
	{
		printf("not find\n");
	}


	return 0;
}
